Evidence for gravitational lensing of GRB 200716C
Xing Yang, Hou-Jun L\"u, Hao-Yu Yuan, Jared Rice, Zhao Zhang, Bin-Bin, Zhang, and En-Wei Liang

TL;DR
This paper presents evidence that GRB 200716C's two pulses are likely caused by gravitational lensing, with Bayesian analysis estimating the lensing parameters and suggesting a possible lensing object of about 2.4×10^5 solar masses.
Contribution
The study provides the first Bayesian analysis indicating gravitational lensing in a GRB with detailed temporal and spectral evidence, estimating lens parameters and false alarm probability.
Findings
Bayesian analysis supports gravitational lensing hypothesis.
Estimated lens mass is approximately 2.4×10^5 solar masses.
False alarm probability for lensing detection is about 0.07%.
Abstract
Observationally, there is a small fraction of Gamma-ray bursts (GRBs) with prompt emission observed by Fermi/GBM that are composed of two pulses. Occasionally, the distance to a GRB may be lensed when a high mass astrophysical object resides in the path between the GRB source and observer. In this paper, we describe GRB 200716C, which has a two-pulse emission and duration of a few seconds. We present a Bayesian analysis identifying gravitational lensing in both temporal and spectral properties, and calculate the time delay ( s) and magnification () between those two pulses based on the temporal fits. One can roughly estimate the lens mass to be about in the rest frame. We also calculate the false alarm probability for this detection to be about 0.07\% with trial factors, and a present-day number density of about $808…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
